From 51072bd6bf79ef2bc6a922079bff57c31c1effbc Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 23 Jul 2016 20:47:26 +0000
Subject: Vendor import of libc++ release_39 branch r276489:
 https://llvm.org/svn/llvm-project/libcxx/branches/release_39@276489

---
 .../func.wrap.func.con/alloc_rfunction.pass.cpp    | 66 +++++++++++++++++-----
 1 file changed, 52 insertions(+), 14 deletions(-)

(limited to 'test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp')

diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp
index aa6b743b5236..403d646f4216 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03
+
 // <functional>
 
 // class function<R(ArgTypes...)>
@@ -14,8 +16,10 @@
 // template<class A> function(allocator_arg_t, const A&, function&&);
 
 #include <functional>
+#include <memory>
 #include <cassert>
 
+#include "test_macros.h"
 #include "min_allocator.h"
 #include "count_new.hpp"
 
@@ -46,23 +50,57 @@ public:
 
 int A::count = 0;
 
+int g(int) { return 0; }
+
 int main()
 {
-#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     assert(globalMemCounter.checkOutstandingNewEq(0));
     {
-    std::function<int(int)> f = A();
-    assert(A::count == 1);
-    assert(globalMemCounter.checkOutstandingNewEq(1));
-    assert(f.target<A>());
-    assert(f.target<int(*)(int)>() == 0);
-    std::function<int(int)> f2(std::allocator_arg, bare_allocator<A>(), std::move(f));
-    assert(A::count == 1);
-    assert(globalMemCounter.checkOutstandingNewEq(1));
-    assert(f2.target<A>());
-    assert(f2.target<int(*)(int)>() == 0);
-    assert(f.target<A>() == 0);
-    assert(f.target<int(*)(int)>() == 0);
+        std::function<int(int)> f = A();
+        assert(A::count == 1);
+        assert(globalMemCounter.checkOutstandingNewEq(1));
+        assert(f.target<A>());
+        assert(f.target<int(*)(int)>() == 0);
+        std::function<int(int)> f2(std::allocator_arg, bare_allocator<A>(), std::move(f));
+        assert(A::count == 1);
+        assert(globalMemCounter.checkOutstandingNewEq(1));
+        assert(f2.target<A>());
+        assert(f2.target<int(*)(int)>() == 0);
+        assert(f.target<A>() == 0);
+        assert(f.target<int(*)(int)>() == 0);
+    }
+    assert(globalMemCounter.checkOutstandingNewEq(0));
+    {
+        // Test that moving a function constructed from a reference wrapper
+        // is done without allocating.
+        DisableAllocationGuard g;
+        using Ref = std::reference_wrapper<A>;
+        A a;
+        Ref aref(a);
+        std::function<int(int)> f(aref);
+        assert(A::count == 1);
+        assert(f.target<A>() == nullptr);
+        assert(f.target<Ref>());
+        std::function<int(int)> f2(std::allocator_arg, std::allocator<void>{},
+                                   std::move(f));
+        assert(A::count == 1);
+        assert(f2.target<A>() == nullptr);
+        assert(f2.target<Ref>());
+        assert(f.target<Ref>()); // f is unchanged because the target is small
+    }
+    {
+        // Test that moving a function constructed from a function pointer
+        // is done without allocating
+        DisableAllocationGuard guard;
+        using Ptr = int(*)(int);
+        Ptr p = g;
+        std::function<int(int)> f(p);
+        assert(f.target<A>() == nullptr);
+        assert(f.target<Ptr>());
+        std::function<int(int)> f2(std::allocator_arg, std::allocator<void>(),
+                                   std::move(f));
+        assert(f2.target<A>() == nullptr);
+        assert(f2.target<Ptr>());
+        assert(f.target<Ptr>()); // f is unchanged because the target is small
     }
-#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 }
-- 
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